Bumped SBT to 0.13.6; disabled name hashing.
Remove type annotation no longer necessary in Scala 2.11. Fixes #126.
Added code of conduct section to README.
Refined participation section.
Added missing link to issues.
Various version number tweaks.
Bumped SBT version to 0.13.7-M3; reenabled name hashing.
Dropped covariance annotation on Lub (see https://github.com/milessabin/shapeless/issues/242)
Changes in coproduct Unifier. Fixes https://github.com/milessabin/shapeless/issues/242
Merge pull request #243 from alexarchambault/coproductunify

Coproduct unify (https://github.com/milessabin/shapeless/issues/242)